Receiving device for electric transmission.



PATENTED MAR. 5, 190.7.

I. KITSBE. DEVICE FCR ELECTRIC TRANSMISSION.

RECEIVING AYPLICATION FILED APB.. 10. 1905.

w Mmm/J e. o if @ff C i Y I@ N .M N Mww UNITED STATES PATENT OFFICE.

ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO WILLIAM J LATTA, OF PHILADELPHIA, PENNSYLVANIA.

RECEIVING DEVICE FOR ELECTRIC TRANSMISSION.

Specification of Letters Patent.

Patented March 5, 1907.

Application filed April l0, 1905. SGI'ial. No. 254,768.

To aZ whom it may concern.-

Be it known that I, IsiDoR KITSEE, of the city and county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Receiving Devices for Electric Transmission, of which the following is a specification.

My invention relates to an improvement in receiving devices sensitive for currents-A such, for instance, as are used in long-distance tel egra phy telephony, or wireless transmission.

The accompanying drawing illustrates in diagrammatic View my invention. In this drawing I have illustrated a telephonie rei ceiver as part of the device; but it is obvious that instead of a telephonie receiver any other of the well-known devices adapted to be actuated by current impulses may be substituted--such, for instance, as a recorder, sounder, or relay.

In the drawing, A represents the primary coil of an alternating or interrupted current-such, for instance, as the primary of an inductorium. B is the secondary thereof, and b are means to connect one or more parts of the secondary with the switch O. This switch is connected, through wire 13, with one pole of a source of direct current, (here shown as the positive pole of the battery D.) The other pole of this source of current is connected, through wire 12, with the junction of the wires 9 and 11.

The terminals of the secondary B are connected, one through wire 5 and the other through :fire G, with the adjustable screwcontacts E and F, respectively. These screw-contacts are arranged in pairs, E and E forming one pair land F and F forming the second pair, having the air-gaps e and f, respectively, between them.

G is the receiver proper. (Here shown as part of a telephonie receiver.) The construction of the device G is the usual one in ear-pliones, with the exception that instead of one coil the core near the diaphragm is provided with two coils running parallel to each other, and in the drawing these coils are designated as g and g', the terminals of the coil g being designated by the numerals 1 and 2 and the terminals of the coil g being designated by the numerals 3 and 4:. The adjustable screw-contact E is connected, through wire 8, with the terminal 1 of the coil g, the terminal 2 of this coil being connected, through wire 11. with wire 12. The adjustable contact F is connected, through wire 7, with the terminal 3 of the coil g', the terminal 4 of said coil being con nected, through wire 9, with the wire 12. The adjustable screw-contact E is connected to one part of the line of transmission H, and the adjustable contact E is connected to the other part of the line of transmission H.

It is supposed that the interrupted or alternating current of the necessary high poteni tial is flowing through B, and it is supposed that the switch C touches one or the other of the contact-points b, attached to this coil B. The current flowing through this coil will divide and will ow in part through the circuit embracing Wire 6, adjustable contacts F and F with their air-gapj, wire 7, terminal 3, coil g', terminal 4, resistance r, wire 9, wire 12, battery D, wire 13, and switch C, contact b,back to the source B. 'lhe other part of the current will flow through the circuit embracing wire 5, contacts E and E', withl their air-gap e, Wire 8, terminal 1 of the coil (7, through this coil, terminal 2, resistance r, wire 11, Wire 12, battery D, wire 13, switch O, contact b, back to the source B, and if both branches of this device are of the same resistance and their other electrical conditions are equal then the current will divide in equal proportions and the coils g and g will be equally effected by the flow of said current; but as the connection of the coils g and g are in opposition as to each other the effect of the current-flow through g will be neutralized by g', and vice versa, and the diaphragm will therefore remain silent. Should the resistance of either one or the other of these branches be increased or decreased or should the resistance of one of the air-gaps be altered or a current from a foreign source be sent through one of these air-gaps, then the equilibrium through these two circuits will be destroyed and the receiving device (here the diaphragm of the receiver (i) will be actuated. lt is now supposed that a perfect equilibrium is established between the branch embracing the air-gap f and the branch embracing the air-gap e and that therefore the diaphragm of the receiver G remains silent. If now an electric impulse is sent over the art of the line of transmission indicated as II through the air-gap e to the other part of IOO IOR

the line of transmission H then the perfect balance which is necessary to keep the diaphragm silent is destroyed, and this diaphragm will vibrate in accordance with these disturbances ofthe balance.

In using this instrument it is necessary that first of all a true balance should be established-that is, the instrument should be adjusted till the point is reached where the receiver remains entirelyT silent. For this reason I have provided the movable switch C and the difi'erent contacts b, so that the operator shall at will place more or less of the secondary B in one or the other of the branches of the circuit. For this reason also I have made the contacts E and E', as well as the contacts F and F', adjustable, so that the air-gaps between them may be increased at will, and for this reason I have further provided the two coils or terminals of same with the variable resistances r.

As is well known, a source of direct current of comparative low resistance could not liow through an air-gap; but if Vthe path through this air-gap is .made conducting through the fiow of an interrupted or alternating current then the direct current Will follow the path established by such alternating current and will vary in accordance with the varying flow of this alternating or interrupted current. As long as the equilibrium of both branches is maintained the flow of the current from D will be equal in both of them; but the slightest variation in the flow of the alternating or interrupted current through e or f will change the ratio of this flow, and I have found that even such small currents as the incoming impulse of a wireless or telephonic transmission will produce such change.

As stated above, this instrument may be used in telegraphy. It may also be used in wireless transmission, and its sensitiveness is so great that it even will respond to telephonic impulses.

Having now described vmy invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In combination with means to receive electric impulses, a receiving device operatively connected with a source of alternating or interrupted current, in a manner so as to nullify the effect of said impulses, a source of direct current, means to nullif-y the effect of said direct source on said receiver, and means to disturb the nullifying efliect in accordance with the incoming impulses.

2. A receiving instrument for electric transmission provided with two coils, each of said coils connected to a source of alternating or interrupted current and a source of direct current, the action of one of said coils nullif'ying the action of the second of said coils and means to vary the nullifying eflect in accordance with the impulses received.

3. In electric transmission a receiving device, a source of alternating or interrupted current and a source of direct current, both normally connected to said receiving device, adjustable means to vary `the flow of said currents through said receiving device in a manner so as to nullify its efl`ect on said device, and means to receive transmitted impulses, said transmitted impulses adapted to vary said nullifying effect.

In testimony whereof I hereby sign my name, in the presence of two subscribing witnesses, this 6th day of April, A. D. 1905.

ISIDOR KITSEE.

I/Vitnesses:

EDITH R. STILLEY` H. C. YETTER. 

